If you are thinking about refinancing your mortgage in Ontario, one of the first questions is usually simple: How much equity do I need?
For many conventional refinancing situations, the 80% loan-to-value limit is an important starting point. In simple terms, total mortgage borrowing generally cannot exceed 80% of the property’s accepted value for an uninsured mortgage. That means a homeowner generally needs to leave at least 20% equity in the property when refinancing within that limit.
But having 20% equity does not automatically mean you can refinance or access all of the equity above that amount.
Property value, existing mortgage and HELOC balances, income, credit, debts, employment, mortgage terms, qualification requirements, and lender policies can all affect what is actually available.
At Mortgage Brain, we encourage Ontario homeowners to separate three questions: How much equity do I have? How much borrowing room does the property support? How much financing might I qualify for?
Quick Answer
For a conventional uninsured mortgage refinance, 80% loan-to-value, or LTV, is an important maximum threshold. OSFI states that the legal maximum LTV for uninsured mortgages is currently 80%.
For example, if a lender accepts your property value at $800,000, an 80% LTV calculation equals $640,000:
$800,000 × 80% = $640,000
If you already owe $500,000 against the property, the simplified calculation leaves $140,000 of potential borrowing room before considering other secured debts, transaction costs, qualification, and lender requirements.
That does not mean you automatically qualify for another $140,000.
The most useful distinction is:
Home equity tells you how much of the property you own. Loan-to-value limits determine how much secured borrowing the property may support. Qualification determines whether the proposed financing may actually be available.
Key Takeaways
- The legal maximum LTV for uninsured mortgages is currently 80%, according to OSFI.
- An 80% LTV limit generally means at least 20% of the property’s accepted value remains outside the mortgage borrowing calculation.
- Existing mortgages, HELOCs, and other loans secured against the property can reduce available refinancing room.
- A HELOC has different limits from an amortizing mortgage. FCAC lists the HELOC credit limit at up to 65% of a home’s appraised value.
- Having sufficient equity does not guarantee refinancing approval.
- Income, credit, debts, employment, property value, mortgage terms, qualification rules, and lender requirements also matter.
What Is Home Equity?
Home equity is the portion of your property value that is not represented by debt secured against the home.
FCAC defines home equity as the difference between the appraised value of the property and the amount owing on the mortgage, HELOC, and other loans or lines of credit secured by the home.
The basic calculation is:
Home equity = Appraised property value − secured debt
Suppose your home is appraised at $750,000 and your only secured debt is a $450,000 mortgage.
Your gross home equity would be:
$750,000 − $450,000 = $300,000
That means you have $300,000 in gross equity.
It does not mean you can refinance and withdraw the entire $300,000.
What Does the 80% Loan-to-Value Limit Mean?
Loan-to-value ratio compares the amount of borrowing secured against a property with the property’s value.
The calculation is:
LTV = Secured borrowing ÷ Property value × 100
For example, a $600,000 mortgage against a property valued at $800,000 represents:
$600,000 ÷ $800,000 = 75% LTV
OSFI states that the legal maximum LTV for uninsured mortgages is currently 80%. Its residential mortgage guidance also describes mortgages at or below 80% LTV as conventional or low-ratio mortgages that do not require mortgage insurance by law.
This is why homeowners often hear that they need approximately 20% equity to refinance.
However, the 20% figure should not be interpreted as an approval rule. A lender still needs to assess the borrower, property, requested mortgage, and overall transaction.
How Much Can You Refinance With 20% Equity?
A useful starting calculation is:
Property value × 80% − existing secured debt = potential refinancing room
Consider an Ontario homeowner whose property is accepted at $900,000 and who owes $550,000 on the existing mortgage.
| Calculation | Amount |
|---|---|
| Accepted property value | $900,000 |
| 80% of property value | $720,000 |
| Existing mortgage | $550,000 |
| Illustrative potential room | $170,000 |
Based strictly on this calculation, there could be up to $170,000 between the existing mortgage and an 80% LTV amount.
But this is potential property-based borrowing room, not an approval.
If there is an existing HELOC, second mortgage, or another loan secured against the home, that borrowing also needs to be considered. Qualification and lender requirements can reduce the amount available further.
Is 20% Equity Enough to Guarantee a Refinance?
No.
This is one of the most important distinctions for homeowners to understand.
Equity answers a property question. It does not answer every qualification question.
FSRA explains that mortgage applications can involve reviewing income, employment, debt obligations, property details, mortgage needs and objectives, and the value of the property being used as collateral.
A refinancing assessment may consider:
- Income and employment
- Credit profile
- Existing mortgage balance
- HELOC and other secured debt
- Credit cards, loans, and other obligations
- Property value
- Property type and location
- Property taxes and heating costs
- Debt-service ratios
- Requested mortgage amount
- Mortgage amortization
- Lender underwriting requirements
At Mortgage Brain, a useful way to think about this is:
20% equity can help satisfy the property side of an 80% LTV calculation. It does not by itself satisfy the borrower side of mortgage qualification.
Why Does the Appraised Value Matter?
The 80% calculation is only as useful as the property value the lender accepts.
Suppose you believe your home is worth $850,000.
At 80%, that produces a maximum secured-borrowing calculation of:
$850,000 × 80% = $680,000
But suppose the lender’s accepted appraisal is $775,000.
The calculation becomes:
$775,000 × 80% = $620,000
That $75,000 difference in property value reduces the illustrative 80% borrowing calculation by $60,000.
FSRA notes that lenders need to validate property value because the home serves as collateral. Depending on the transaction, a lender may review property information or listings, obtain an appraisal, or request an inspection.
This is why homeowners should avoid planning a refinance around an online estimate, previous purchase price, or expected selling price alone.
How Do You Calculate the Minimum Property Value Needed to Refinance?
You can also work backwards from the proposed mortgage amount.
The simplified calculation is:
Required property value = Proposed secured borrowing ÷ 80%
Suppose you want the total mortgage after refinancing to be $600,000.
Using an 80% maximum LTV:
$600,000 ÷ 0.80 = $750,000
The property would therefore need an accepted value of at least $750,000 to support $600,000 of secured borrowing under that particular 80% calculation.
This does not mean a $750,000 appraisal guarantees approval for a $600,000 refinance. It only addresses the loan-to-value component.
Is Home Equity the Same as Available Refinancing Room?
No.
This is where refinance calculations often become confusing.
Consider a property worth $1 million with a $600,000 mortgage.
The homeowner has:
$1,000,000 − $600,000 = $400,000 in gross equity
But an 80% LTV calculation would produce:
$1,000,000 × 80% = $800,000
After subtracting the existing $600,000 mortgage:
$800,000 − $600,000 = $200,000
So the homeowner has $400,000 in gross equity, but only $200,000 between the existing mortgage and the illustrative 80% ceiling.
At Mortgage Brain, we separate these three numbers:
Gross equity: What remains after subtracting secured debt from property value.
Potential borrowing room: What may remain within the applicable LTV limit.
Qualified borrowing: What may ultimately be available after borrower, property, product, and lender requirements are considered.
Keeping these numbers separate makes refinancing easier to understand.
Does the 80% Limit Apply to a HELOC?
The rules are different for revolving home-equity credit.
FCAC’s comparison of home-equity borrowing products lists a HELOC credit limit of up to 65% of the appraised value of the home.
OSFI also states that the legal maximum for uninsured mortgage lending is 80% LTV, while lending above the 65% LTV threshold in certain combined mortgage and HELOC products must be amortizing and non-readvanceable.
In plain English, the fact that total secured borrowing may fit within an 80% calculation does not mean the entire amount can necessarily be structured as a revolving HELOC.
The product structure matters.
Can You Refinance to Consolidate Debt?
Potentially.
Some Ontario homeowners consider refinancing to consolidate credit-card balances, unsecured lines of credit, personal loans, or other higher-interest debts.
Home equity can be one part of determining whether that is possible, but it is not the only consideration.
Suitability depends on factors including:
- Income
- Credit profile
- Home equity
- Property value
- Existing mortgage terms
- Consumer debt levels
- Employment stability
- Financial goals
- Qualification and lender requirements
There are also important trade-offs.
Using mortgage financing to repay unsecured debt converts that borrowing into debt secured against the home. A refinance may also extend repayment over a longer period. As a result, a lower rate or required monthly payment does not necessarily mean lower total borrowing costs.
Debt consolidation should therefore be evaluated on more than monthly payment alone.
Do You Have to Pass the Mortgage Stress Test When Refinancing?
For many uninsured mortgages at federally regulated lenders, refinancing involves mortgage qualification under OSFI’s Minimum Qualifying Rate.
OSFI currently sets the MQR for uninsured mortgages at the greater of:
the mortgage contract rate plus 2 percentage points, or 5.25%.
The rules differ for certain eligible uninsured straight switches at renewal where neither the loan amount nor amortization is increased. A refinance involving additional borrowing is different from that type of straight switch.
This is another reason sufficient equity alone does not establish refinancing eligibility.
A Practical Ontario Homeowner Example
Consider a homeowner with:
- Property value accepted by the lender: $800,000
- Existing mortgage: $500,000
- Existing HELOC: $40,000
- Proposed additional funds: $50,000
Their gross equity before considering the proposed refinance is:
$800,000 − $540,000 = $260,000
An illustrative 80% calculation produces:
$800,000 × 80% = $640,000
Existing secured borrowing totals $540,000, leaving $100,000 between current secured debt and the illustrative 80% ceiling.
The requested additional $50,000 fits within that property-based calculation.
But the review is not finished.
The lender would still need to assess the borrower, property, proposed structure, and applicable qualification requirements.
This example shows why having enough equity and qualifying for the refinance are two different steps.
Important Mortgage Terms to Understand
Home Equity: The difference between the home’s value and debt secured against it.
Loan-to-Value Ratio: The percentage of the property’s value represented by secured borrowing.
Refinancing: Replacing or restructuring mortgage financing, often involving a change to the mortgage amount, amortization, or borrowing purpose.
Appraisal: A property valuation that may be used by a lender to determine an acceptable value for mortgage purposes.
HELOC: A revolving line of credit secured against a property.
Uninsured Mortgage: A mortgage that is not protected by mortgage default insurance. Conventional mortgages at 80% LTV or below generally do not require mortgage insurance by law.
Minimum Qualifying Rate: The qualifying rate applied by federally regulated lenders to many uninsured mortgage applications.
What Should You Consider Before Refinancing?
Equity is only the starting point.
How Much Do You Actually Need?
Borrowing more simply because equity exists can increase the amount of debt secured against the home.
What Is Your Property Worth for Lending Purposes?
Use the value accepted by the lender rather than relying only on an online estimate or previous sale price.
What Are the Costs?
FCAC notes that borrowing against home equity can involve costs such as appraisal, title search, title insurance, and legal fees.
Depending on the existing mortgage, refinancing may also involve prepayment or discharge costs.
What Happens to the Repayment Period?
Extending amortization can reduce required payments under certain assumptions but may increase total interest costs because the debt is repaid over more time.
Does the New Structure Fit Your Circumstances?
Consider the payment, total borrowing cost, debt being consolidated, future property plans, prepayment flexibility, and how long you expect to carry the mortgage.
How Mortgage Brain Can Help
Mortgage Brain can help Ontario homeowners review the numbers behind a potential refinance rather than focusing only on the amount of equity shown on paper.
A review may consider:
- Property value
- Mortgage balance
- Existing HELOC or secured debt
- Loan-to-value ratio
- Available equity
- Requested refinance amount
- Income and employment
- Credit profile
- Consumer debt
- Mortgage terms and potential costs
- Qualification requirements
- Longer-term financial objectives
You can also use the Mortgage Brain mortgage calculator to explore estimated mortgage-payment scenarios. Calculator results are estimates only and do not represent qualification, approval, or a guaranteed rate.
Frequently Asked Questions
How much equity do I need to refinance my mortgage in Ontario?
For a conventional uninsured mortgage refinance, the legal maximum LTV is currently 80%, meaning the financing generally needs to remain at or below 80% of the property’s accepted value. Other qualification and lender requirements still apply.
Does 20% equity mean I can refinance?
Not automatically. Having enough equity to fit within an 80% LTV calculation addresses one part of the application. Income, credit, debts, employment, property details, mortgage structure, and lender requirements can also affect qualification.
Can I refinance up to 80% of my home’s value?
Potentially, depending on the mortgage product, property, borrower qualification, and lender requirements. Existing mortgages and other secured debt must be included when calculating total borrowing against the property.
How do I calculate how much equity I can access?
A simplified starting point for an 80% LTV refinance is:
Appraised value × 80% − existing secured debt = potential property-based borrowing room
This is not the same as an approved borrowing amount.
Does my HELOC count when calculating available equity?
Yes. FCAC’s definition of home equity takes into account mortgages, HELOCs, and other loans and lines of credit secured against the home.
Can I refinance if my home value has fallen?
Potentially. A lower value may increase your LTV and reduce available refinancing room, but the result depends on the accepted property value, secured debt, amount requested, borrower qualification, and lender requirements.
Is the HELOC limit also 80%?
Not for the revolving HELOC portion. FCAC lists HELOC borrowing at up to 65% of a home’s appraised value. Combined mortgage and HELOC structures can involve additional rules.
Do I need an appraisal to refinance?
A lender needs to validate the property’s value, but a full appraisal is not necessarily required in every case. FSRA notes that lenders may use different valuation methods depending on the property and transaction.
Final Thoughts
For many Ontario homeowners, understanding the 80% loan-to-value limit is a useful first step when considering refinancing.
But 20% equity is not the same as 20% available to borrow.
A homeowner may have substantial gross equity while having much less refinancing room after the applicable LTV limit and existing secured debts are considered. Even when sufficient property-based borrowing room exists, the borrower must still meet applicable qualification and lender requirements.
A useful way to remember the process is:
Property value establishes the starting point. LTV sets the property-based borrowing boundary. Existing secured debt reduces available room. Qualification determines whether the proposed financing may actually be available.
If you’re unsure whether refinancing, debt consolidation, or accessing home equity makes sense for your circumstances, speaking with a Mortgage Brain advisor can help you better understand the available options and trade-offs before making a decision.
Sources Referenced
- Financial Consumer Agency of Canada, Borrowing Against Home Equity.
- Office of the Superintendent of Financial Institutions, Clarification on the Treatment of Innovative Real Estate Secured Lending Products under Guideline B-20.
- Office of the Superintendent of Financial Institutions, Minimum Qualifying Rate for Uninsured Mortgages.
- Office of the Superintendent of Financial Institutions, Residential Mortgage Underwriting Practices and Procedures, Guideline B-20.
- Financial Services Regulatory Authority of Ontario, Mortgage Application Process.
Disclaimer
Mortgage Brain AI is a sub-brand of Matrix Mortgage Global, FSRA Licence #11108.
This article is for general educational purposes only and does not constitute financial, legal, tax, investment, credit-counselling, insolvency, or personalized mortgage advice.
Mortgage refinancing, debt consolidation, HELOCs, and other home-equity solutions are subject to lender approval, income and employment verification, credit review, property valuation, applicable loan-to-value limits, mortgage terms, documentation, regulations, qualification requirements, and individual lender policies.
The 80% LTV examples in this article are simplified illustrations of property-based borrowing calculations and do not represent an approved or guaranteed mortgage amount. Different products and transactions may be subject to different limits or requirements.
Using home equity to repay unsecured debt may convert that debt into borrowing secured against the property. Refinancing does not eliminate debt. A lower interest rate or required monthly payment does not necessarily result in lower total borrowing costs.
Property values, mortgage rates, qualification requirements, lender policies, products, regulations, and fees may change.
Mortgage Brain does not guarantee mortgage approval, refinancing eligibility, debt consolidation, access to home equity, a particular interest rate, lower payments, interest savings, or any specific financial outcome.
